Feeding device for sewing-machines



(No Model.)

B. MCDONALD. FEEDING DEVICE FOR SEWING MACHINES. "No. 313,945. Patented Mar. 17, 1885.

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EPHRAIM MCDONALD, OF SOMERVIIJLE, MASSACHUSETTS.

FEEDING DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent. No. 313,945, dated March 17, 1885.

Application filed August 19, 1884.

To 01. whom it may concern.-

Be it known that I, EPHRAIM MCDONALD, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in Feeding Devices forSewing- Machines, of which the following is aspecification.

This invention has for its object to provide improved mechanism for imparting to a pivoted or swinging foot a positive movement in the direction that the work is fed by the feeding device under the presser-foot'.

The invention consists in the improved mechanism, which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents an elevation of the rear side of the arm of a sewing-machine provided with my improvements. Fig. 2 represents an end elevation of the same. Fig. 3 represents a section on line as as, Fig. 1.

The same letters of reference indicate the same parts in all the figures.

1n the drawings, a represents the head or outer portion of the arm of a sewing-machine. represents the presser-bar, which is provided with the presser-foot b, and is pivoted at c to an arm, (2, rigidly affixed to a rock-shaft, f, which is mounted in a bearing on the head a, and is oscillated by means of a roller, 6, eecentrically placed on a disk, f, on the needle'bar-operating shaft g, said roller acting on an arm, h, at the inner end of a rock-shaft, f, and raising said arm, with the arm 01 and presser-bar b, intermittently. A spring, 2', is secured atone end to the head a,

and at the other end to the presser-bar, forcing the presser-bar downwardly after it is thus raised, and keeping the arm h normally in position, to be acted on by the roller 0. The pivoted connection of the presser-bar to the arm cl enables said bar, with its foot,to oscillate toward and from the operator, the described devices giving the presser-bar its usual vertical movements, whereby the foot is caused to alternately grasp and release the material being stitched.

The construction thus far described is old, and forms no part of my invention.

My improvement comprises a rock-shaft, g,

mounted in a bearing, h, at the rear side of (No model.)

the head a, an arm, t", affixed to one end of said rock-shaft and arranged to project into the path in which the roller 6 moves, an arm, j, aflixed to the opposite end of the rock-shaft g, and projecting downwardly therefrom, and a link, k, connecting the lower end of the arm j with the presser-bar I). These devices constitute a simple and easilyapplied means for positively moving the presser-foot with the feeding device I, (here shown as a wheel,) while the foot is pressed upon the material. The roller e acts on the arm 71 before it reaches the arm h of the presser-elevating devices, and in passing said arm i moves it outwardly, thus moving the armj and thepresser-bar connected therewith in the directionthat the work is fed, said movement occurring simultaneously with the feed movement. The presser-foot is thus caused to act as an auxiliary to the feeding device, which is operated positively from beneath in any suitable manner.

The extent of the feed movement imparted to the presser-foot by the described devices is determined by an adjustable block, 2, on the arm 2'. Said block has pins 3 3, which are adapted to slidein sockets in the arm t, and are fixed at any desired distance from the arm by a wedge, 4, interposed between the block2 and arm i. Said wedge is secured to thearm '5 by a set-screw, 5, whichpasses through aslot, 6, in the arm. Said slot enables the set-screw and wedge to be adjusted so as to vary the projection of the block 2 from the arm, as may be desired. The wedge is provided with slots through which the pins 3 3 pass. The spring t, which depresses the presser-bar, also forces it forward toward the operator after the roller 6 passes the arm 73, said spring being deflected from its normal position by the feed movement of the presser-bar.

It will be seen that the devices constituting my improvement may be very readily applied to the head a, the only labor required being to screw the hearing it to the head and secure the link 70 to the presser-bar.

I claim-- 1. The combination, with the feed 1, the pivoted presser-bar, and the mechanism for verticall y moving the same, ofthe rock-shaft g, having the. arms z" j, and the link It, connecting the arm j with the presser-bar, as set forth.

2. The combination, with the pivoted press er-bar, and the mechanism for vertically movscribing witnesses, this 9th day of August,

ing the same, of the rock-shaft 9, having the 1884. i arms ij, theiink k, conneetingthearn y' with EPHRAIM MCDONALD. the presser-bar, the block 2 on the arm 2', and Witnesses: 5 the adjusting devices for said block, as set forth. 0. F. BROWN,

In testimony whereof Ihave signed my name H. BROWN.

to this specificatiomin the presence of two sub- 

